Siemens SIMATIC ET 200SP Manual page 33

Input with ground return
To achieve SIL3/Cat.4/PLe see section Installation of the ground line between the power
supply and the BaseUnit (Page 26).
In this application for potential-free, fail-safe digital inputs, the connection DI
digital input is returned to the internal ground M
Figure 5-4
In case of a cross-circuit between a positive potential (e.g. L+) and DQ-PP
permanently present at the fail-safe digital input. To prevent cross-circuits between positive
potential (e.g. L+) and DQ-PP
inputs in a cross-circuit-proof manner, for example, as separate, sheathed cables or in
separate cable ducts.
Digital output module F-DQ 8x24VDC/0.5A PP HF (6ES7136-6DC00-0CA0)
Manual, 05/2017, A5E38578424-AA
5.4 Application: Connection of a fail-safe digital input to each digital output
Wiring diagram of an output of the digital output module F-DQ 8x24VDC/0.5A PP HF
with an input of a fail-safe digital input module (with ground return).
WARNING
of the fail-safe digital output module.
n
, you must route the lines used to connect the fail-safe digital
n
Applications of the F-I/O module
- of the fail-safe
n
, a 1-signal is
n
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